Step1 Open the web browser and type the LAN IP address of the router in the address bar, the default IP address of TP-LINK router is 192.168.1.1, and then press Enter.
Step 2 Type the username and password in the login page, the default username and password both are admin.
Step 3 Click Security->Firewall on the left page.
Step 4 Select Enable Firewall, Enable IP Address Filtering, Allow the packets not specified by any filtering rules to pass through the router.
Step 5 Click Save to save the settings.
Step 6 Click IP Address Filtering on the left of the page.
Step 7 Click Add New to set the IP Address Filtering rule.
Step 8 Type the IP Address which you would like to limit service on your computer and the WAN Port as service port. Then select Deny of the Action.
Step 9 Click Save to save the settings.